--- /dev/null
+//
+// NetworkReachabilityManager.swift
+//
+// Copyright (c) 2014-2017 Alamofire Software Foundation (http://alamofire.org/)
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+//
+
+#if !os(watchOS)
+
+import Foundation
+import SystemConfiguration
+
+/// The `NetworkReachabilityManager` class listens for reachability changes of hosts and addresses for both WWAN and
+/// WiFi network interfaces.
+///
+/// Reachability can be used to determine background information about why a network operation failed, or to retry
+/// network requests when a connection is established. It should not be used to prevent a user from initiating a network
+/// request, as it's possible that an initial request may be required to establish reachability.
+public class NetworkReachabilityManager {
+ /// Defines the various states of network reachability.
+ ///
+ /// - unknown: It is unknown whether the network is reachable.
+ /// - notReachable: The network is not reachable.
+ /// - reachable: The network is reachable.
+ public enum NetworkReachabilityStatus {
+ case unknown
+ case notReachable
+ case reachable(ConnectionType)
+ }
+
+ /// Defines the various connection types detected by reachability flags.
+ ///
+ /// - ethernetOrWiFi: The connection type is either over Ethernet or WiFi.
+ /// - wwan: The connection type is a WWAN connection.
+ public enum ConnectionType {
+ case ethernetOrWiFi
+ case wwan
+ }
+
+ /// A closure executed when the network reachability status changes. The closure takes a single argument: the
+ /// network reachability status.
+ public typealias Listener = (NetworkReachabilityStatus) -> Void
+
+ // MARK: - Properties
+
+ /// Whether the network is currently reachable.
+ public var isReachable: Bool { return isReachableOnWWAN || isReachableOnEthernetOrWiFi }
+
+ /// Whether the network is currently reachable over the WWAN interface.
+ public var isReachableOnWWAN: Bool { return networkReachabilityStatus == .reachable(.wwan) }
+
+ /// Whether the network is currently reachable over Ethernet or WiFi interface.
+ public var isReachableOnEthernetOrWiFi: Bool { return networkReachabilityStatus == .reachable(.ethernetOrWiFi) }
+
+ /// The current network reachability status.
+ public var networkReachabilityStatus: NetworkReachabilityStatus {
+ guard let flags = self.flags else { return .unknown }
+ return networkReachabilityStatusForFlags(flags)
+ }
+
+ /// The dispatch queue to execute the `listener` closure on.
+ public var listenerQueue: DispatchQueue = DispatchQueue.main
+
+ /// A closure executed when the network reachability status changes.
+ public var listener: Listener?
+
+ private var flags: SCNetworkReachabilityFlags? {
+ var flags = SCNetworkReachabilityFlags()
+
+ if SCNetworkReachabilityGetFlags(reachability, &flags) {
+ return flags
+ }
+
+ return nil
+ }
+
+ private let reachability: SCNetworkReachability
+ private var previousFlags: SCNetworkReachabilityFlags
+
+ // MARK: - Initialization
+
+ /// Creates a `NetworkReachabilityManager` instance with the specified host.
+ ///
+ /// - parameter host: The host used to evaluate network reachability.
+ ///
+ /// - returns: The new `NetworkReachabilityManager` instance.
+ public convenience init?(host: String) {
+ guard let reachability = SCNetworkReachabilityCreateWithName(nil, host) else { return nil }
+ self.init(reachability: reachability)
+ }
+
+ /// Creates a `NetworkReachabilityManager` instance that monitors the address 0.0.0.0.
+ ///
+ /// Reachability treats the 0.0.0.0 address as a special token that causes it to monitor the general routing
+ /// status of the device, both IPv4 and IPv6.
+ ///
+ /// - returns: The new `NetworkReachabilityManager` instance.
+ public convenience init?() {
+ var address = sockaddr_in()
+ address.sin_len = UInt8(MemoryLayout<sockaddr_in>.size)
+ address.sin_family = sa_family_t(AF_INET)
+
+ guard let reachability = withUnsafePointer(to: &address, { pointer in
+ return pointer.withMemoryRebound(to: sockaddr.self, capacity: MemoryLayout<sockaddr>.size) {
+ return SCNetworkReachabilityCreateWithAddress(nil, $0)
+ }
+ }) else { return nil }
+
+ self.init(reachability: reachability)
+ }
+
+ private init(reachability: SCNetworkReachability) {
+ self.reachability = reachability
+ self.previousFlags = SCNetworkReachabilityFlags()
+ }
+
+ deinit {
+ stopListening()
+ }
+
+ // MARK: - Listening
+
+ /// Starts listening for changes in network reachability status.
+ ///
+ /// - returns: `true` if listening was started successfully, `false` otherwise.
+ @discardableResult
+ public func startListening() -> Bool {
+ var context = SCNetworkReachabilityContext(version: 0, info: nil, retain: nil, release: nil, copyDescription: nil)
+ context.info = Unmanaged.passUnretained(self).toOpaque()
+
+ let callbackEnabled = SCNetworkReachabilitySetCallback(
+ reachability,
+ { (_, flags, info) in
+ let reachability = Unmanaged<NetworkReachabilityManager>.fromOpaque(info!).takeUnretainedValue()
+ reachability.notifyListener(flags)
+ },
+ &context
+ )
+
+ let queueEnabled = SCNetworkReachabilitySetDispatchQueue(reachability, listenerQueue)
+
+ listenerQueue.async {
+ self.previousFlags = SCNetworkReachabilityFlags()
+ self.notifyListener(self.flags ?? SCNetworkReachabilityFlags())
+ }
+
+ return callbackEnabled && queueEnabled
+ }
+
+ /// Stops listening for changes in network reachability status.
+ public func stopListening() {
+ SCNetworkReachabilitySetCallback(reachability, nil, nil)
+ SCNetworkReachabilitySetDispatchQueue(reachability, nil)
+ }
+
+ // MARK: - Internal - Listener Notification
+
+ func notifyListener(_ flags: SCNetworkReachabilityFlags) {
+ guard previousFlags != flags else { return }
+ previousFlags = flags
+
+ listener?(networkReachabilityStatusForFlags(flags))
+ }
+
+ // MARK: - Internal - Network Reachability Status
+
+ func networkReachabilityStatusForFlags(_ flags: SCNetworkReachabilityFlags) -> NetworkReachabilityStatus {
+ guard isNetworkReachable(with: flags) else { return .notReachable }
+
+ var networkStatus: NetworkReachabilityStatus = .reachable(.ethernetOrWiFi)
+
+ #if os(iOS)
+ if flags.contains(.isWWAN) { networkStatus = .reachable(.wwan) }
+ #endif
+
+ return networkStatus
+ }
+
+ func isNetworkReachable(with flags: SCNetworkReachabilityFlags) -> Bool {
+ let isReachable = flags.contains(.reachable)
+ let needsConnection = flags.contains(.connectionRequired)
+ let canConnectAutomatically = flags.contains(.connectionOnDemand) || flags.contains(.connectionOnTraffic)
+ let canConnectWithoutUserInteraction = canConnectAutomatically && !flags.contains(.interventionRequired)
+
+ return isReachable && (!needsConnection || canConnectWithoutUserInteraction)
+ }
+}
+
+// MARK: -
+
+extension NetworkReachabilityManager.NetworkReachabilityStatus: Equatable {}
+
+/// Returns whether the two network reachability status values are equal.
+///
+/// - parameter lhs: The left-hand side value to compare.
+/// - parameter rhs: The right-hand side value to compare.
+///
+/// - returns: `true` if the two values are equal, `false` otherwise.
+public func ==(
+ lhs: NetworkReachabilityManager.NetworkReachabilityStatus,
+ rhs: NetworkReachabilityManager.NetworkReachabilityStatus)
+ -> Bool
+{
+ switch (lhs, rhs) {
+ case (.unknown, .unknown):
+ return true
+ case (.notReachable, .notReachable):
+ return true
+ case let (.reachable(lhsConnectionType), .reachable(rhsConnectionType)):
+ return lhsConnectionType == rhsConnectionType
+ default:
+ return false
+ }
+}
+
+#endif
fnp / wl-app.git / blobdiff